60% of what number is 9

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319